Solid-State Battery Membrane Support for Edge Damage Prevention
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Solution Overview
Problem
Existing solid-state batteries face issues with the damage and degradation of the solid electrolyte membrane due to area differences between the electrodes and the membrane, leading to potential short-circuits and safety risks, particularly when using polymeric electrolytes with low mechanical strength.
Innovation Solution
A solid-state battery design incorporating a solid electrolyte membrane-protecting member that compensates for area differences by forming a frame-like structure with a polymer material, ensuring close contact with the electrodes to prevent membrane damage, and a manufacturing method using a release sheet to facilitate its integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid electrolyte membrane has a larger area than the electrodes to prevent electric interference, then the insulation property is improved, but the membrane is more likely to be damaged by electrode edges during manufacturing and use
Solution Approach 1:
A protecting member is introduced as an intermediary element between the electrode and the solid electrolyte membrane. This protecting member has a specific area that is larger than the electrode area but smaller than or equal to the membrane area, allowing it to absorb the mechanical stress and prevent direct contact between the electrode edge and the membrane, thus preventing membrane damage while maintaining the membrane's larger area for insulation
Solution Approach 2:
The protecting member is placed in advance between the electrode and the membrane to provide cushioning protection. By positioning this protective layer beforehand, the system prevents potential damage from volumetric deformation and manufacturing processes before they can occur, ensuring the membrane maintains its integrity and insulation properties
2Ease of manufacture
If polymeric solid electrolyte material is used to create a soft and flexible membrane, then the ease of manufacture is improved, but the mechanical strength significantly decreases making handling difficult
Solution Approach 1:
The system creates a composite structure where the polymeric solid electrolyte membrane is combined with a protecting member that has higher mechanical strength. The membrane material itself (PEO, PEO-Li salt mixture, or PEO-block-polyester) maintains its soft and flexible characteristics for ease of manufacture, while the protecting member provides the necessary mechanical strength to prevent damage during handling and processing
3Reliability
If the area of the solid electrolyte membrane is made larger than the electrode area, then the insulation property is improved, but the processing complexity increases due to the need to introduce a protecting member
Solution Approach 1:
The system segments the protective function from the membrane itself by introducing a separate protecting member. This segmentation allows the membrane to focus on its primary function of ion conduction and insulation, while the protecting member handles the mechanical protection function, simplifying the overall processing by clearly defining the role of each component
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively supports the electrolyte membrane, preventing damage and enhancing processing convenience while maintaining electrical insulation and ion conductivity, thus improving the safety and reliability of the battery.
Implementation Method 1
a solid electrolyte membrane having a larger area as compared to the negative electrode and the positive electrode based on a stacked surface
Implementation Method 2
a solid electrolyte membrane-protecting member formed of a polymer material or a composite material
Data Source
Figure 1~3a
Figure 3b~4
Figure 5a~6
AI summary
The present disclosure relates to a solid-state battery. The solid-state battery is provided with a solid electrolyte membrane-protecting member, which compensates for a difference in area between an electrode and a solid electrolyte membrane, and thus the end portion of the solid electrolyte membrane is supported by the solid electrolyte membrane-protecting member. Therefore, even when the solid electrolyte membrane has low mechanical strength due to the use of a polymeric solid electrolyte, or the like, or has low shape stability due to high flexibility, the end portion of the solid electrolyte membrane may be supported by the solid electrolyte membrane-protecting member. As a result, it is possible to prevent damages of the end portion of the solid electrolyte membrane. The present disclosure also relates to a method for manufacturing the solid-state battery. According to the method, the solid electrolyte membrane-protecting member may be disposed in the portion corresponding to a difference in area between the electrode and the solid electrolyte membrane through a simple process. Therefore, it is possible to provide high convenience in processing.